package video.thirddemo;

import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.channel.group.ChannelGroup;
import io.netty.channel.group.DefaultChannelGroup;
import io.netty.util.concurrent.GlobalEventExecutor;

public class TalkServerHandle extends SimpleChannelInboundHandler<String> {
    private static ChannelGroup channelGroup = new DefaultChannelGroup(GlobalEventExecutor.INSTANCE);

    @Override
    protected void channelRead0(ChannelHandlerContext ctx, String msg) throws Exception {
        Channel channel = ctx.channel();

        channelGroup.forEach(ch -> {
            if (ch.equals(channel)) {
                ch.writeAndFlush("[自己] - " + msg + "\n");
            } else {
                ch.writeAndFlush(channel.remoteAddress() + "发送消息:" + msg + "\n");
            }
        });
    }

    //出现异常
    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        cause.printStackTrace();
        ctx.channel().close();
    }

    @Override
    public void handlerAdded(ChannelHandlerContext ctx) throws Exception {
        Channel channel = ctx.channel();
        channelGroup.writeAndFlush("[服务器] - " + channel.remoteAddress() + " 加入");
        channelGroup.add(channel);
    }

    @Override
    public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
        Channel channel = ctx.channel();
        channelGroup.writeAndFlush("[服务器] - " + channel.remoteAddress() + " 加入");
        channelGroup.add(channel);
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {
        Channel channel = ctx.channel();
        channel.writeAndFlush(channel.remoteAddress() + "  上线");
    }

    @Override
    public void channelInactive(ChannelHandlerContext ctx) throws Exception {
        Channel channel = ctx.channel();
        channel.writeAndFlush(channel.remoteAddress() + "  下线");
    }
}
